National Instruments DAQ X Series User Manual

Chapter 7 Counters
© National Instruments 7-35 X Series User Manual
Figure 7-33 shows a continuous pulse train generation (using the rising
edge of Source).
Figure 7-33. Continuous Pulse Train Generation
Continuous pulse train generation is sometimes called frequency division.
If the high and low pulse widths of the output signal are M and N periods,
then the frequency of the Counter n Internal Output signal is equal to the
frequency of the Source input divided by M + N.
For information about connecting counter signals, refer to the Default
Counter/Timer Pinouts section.
Buffered Pulse Train Generation
X Series counters can use the FIFO to perform a buffered pulse train
generation. This pulse train can use implicit timing or sample clock timing.
When using implicit timing, the pulse idle time and active time changes
with each sample you write. With sample clocked timing, each sample you
write updates the idle time and active time of your generation on each
sample clock edge. Idle time and active time can also be defined in terms
of frequency and duty cycle or idle ticks and active ticks.
Note On buffered implicit pulse trains the pulse specifications in the DAQmx Create
Counter Output Channel are ignored so that you generate the number of pulses defined in
the multipoint write. On buffered sample clock pulse trains the pulse specifications in the
DAQmx Create Counter Output Channel are generated after the counters start and before
the first sample clock so that you generate the number of updates defined in the multipoint
write.
Finite Implicit Buffered Pulse Train Generation
This function generates a predetermined number of pulses with variable
idle and active times. Each point you write generates a single pulse. The
number of pairs of idle and active times (pulse specifications) you write
determines the number of pulses generated. All points are generated back
to back to create a user defined pulse train.
SOURCE
OUT
Counter Armed
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National Instruments DAQ X Series Specifications

General

Brand	National Instruments
Model	DAQ X Series
Category	I/O Systems
Language	English